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test-events-static-geteventlisteners.js
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test-events-static-geteventlisteners.js
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'use strict';
// Flags: --expose-internals --no-warnings
const common = require('../common');
const { kWeakHandler } = require('internal/event_target');
const {
deepStrictEqual,
throws,
} = require('assert');
const { getEventListeners, EventEmitter } = require('events');
// Test getEventListeners on EventEmitter
{
const fn1 = common.mustNotCall();
const fn2 = common.mustNotCall();
const emitter = new EventEmitter();
emitter.on('foo', fn1);
emitter.on('foo', fn2);
emitter.on('baz', fn1);
emitter.on('baz', fn1);
deepStrictEqual(getEventListeners(emitter, 'foo'), [fn1, fn2]);
deepStrictEqual(getEventListeners(emitter, 'bar'), []);
deepStrictEqual(getEventListeners(emitter, 'baz'), [fn1, fn1]);
}
// Test getEventListeners on EventTarget
{
const fn1 = common.mustNotCall();
const fn2 = common.mustNotCall();
const target = new EventTarget();
target.addEventListener('foo', fn1);
target.addEventListener('foo', fn2);
target.addEventListener('baz', fn1);
target.addEventListener('baz', fn1);
deepStrictEqual(getEventListeners(target, 'foo'), [fn1, fn2]);
deepStrictEqual(getEventListeners(target, 'bar'), []);
deepStrictEqual(getEventListeners(target, 'baz'), [fn1]);
}
{
throws(() => {
getEventListeners('INVALID_EMITTER');
}, /ERR_INVALID_ARG_TYPE/);
}
{
// Test weak listeners
const target = new EventTarget();
const fn = common.mustNotCall();
target.addEventListener('foo', fn, { [kWeakHandler]: {} });
const listeners = getEventListeners(target, 'foo');
deepStrictEqual(listeners, [fn]);
}